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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 965 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 46 =
  2. 2.Half of 180 =
  3. 3.Double 88 =
  4. 4.Double 31 =
  5. 5.Double 83 =
  6. 6.Double 76 =
  7. 7.Double 61 =
  8. 8.Double 63 =
  9. 9.Double 16 =
  10. 10.Half of 174 =
  11. 11.Double 58 =
  12. 12.Half of 98 =
  13. 13.Half of 196 =
  14. 14.Half of 172 =
  15. 15.Half of 36 =
  16. 16.Half of 58 =
  17. 17.Half of 142 =
  18. 18.Half of 162 =
  19. 19.Half of 70 =
  20. 20.Double 54 =
  21. 21.Half of 128 =
  22. 22.Double 52 =
  23. 23.Double 32 =
  24. 24.Half of 112 =
  25. 25.Double 51 =
  26. 26.Half of 54 =
  27. 27.Double 99 =
  28. 28.Half of 38 =
  29. 29.Half of 60 =
  30. 30.Double 85 =
  31. 31.Double 98 =
  32. 32.Half of 198 =
  33. 33.Half of 86 =
  34. 34.Half of 114 =
  35. 35.Half of 94 =
  36. 36.Double 65 =
  37. 37.Double 19 =
  38. 38.Double 56 =
  39. 39.Double 36 =
  40. 40.Half of 64 =

Answer key

  1. 92
  2. 90
  3. 176
  4. 62
  5. 166
  6. 152
  7. 122
  8. 126
  9. 32
  10. 87
  11. 116
  12. 49
  13. 98
  14. 86
  15. 18
  16. 29
  17. 71
  18. 81
  19. 35
  20. 108
  21. 64
  22. 104
  23. 64
  24. 56
  25. 102
  26. 27
  27. 198
  28. 19
  29. 30
  30. 170
  31. 196
  32. 99
  33. 43
  34. 57
  35. 47
  36. 130
  37. 38
  38. 112
  39. 72
  40. 32

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